---
id: "GHSA-2g87-pp6c-29x5"
kind: "vulnerability"
aliases: ["GHSA-2g87-pp6c-29x5"]
title: "aiohttp: Multiple instances of excessive or unbounded memory/CPU use"
severity: "high"
cvss: null
epss: null
exploited: false
status: "open"
category: "package"
products: [{"name": "aiohttp", "fixed": ["3.14.4"], "affected": "<= 3.14.3", "ecosystem": "pypi"}]
ecosystems: ["pypi"]
tags: ["aiohttp", "cwe-770", "package", "python", "self-hosted"]
not_affected_if: ["version-above-3.14.3"]
published_at: "2026-10-19T17:07:23+00:00"
first_seen_at: "2026-10-23T19:11:32+00:00"
updated_at: "2026-10-23T20:15:34+00:00"
sources: [{"source": "ghsa", "url": "https://github.com/advisories/GHSA-2g87-pp6c-29x5", "first_seen_at": "2026-10-23T19:11:32+00:00"}]
---

# aiohttp: Multiple instances of excessive or unbounded memory/CPU use

aiohttp, a Python async HTTP library, can use unbounded memory or excessive CPU when handling attacker-crafted requests. An attacker can exhaust server resources and degrade or crash the service.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- pypi:aiohttp affected <= 3.14.3 fixed 3.14.4

## How to check

Run pip show aiohttp or pip freeze | grep aiohttp to read the installed version; affected if 3.14.3 or lower.

## Fix

Upgrade aiohttp to 3.14.4 or later.

## Timeline

- 2026-10-23T19:11:32+00:00 ghsa https://github.com/advisories/GHSA-2g87-pp6c-29x5

## From the sources

### Summary

Multiple cases were found where aiohttp could use excessive or unbounded memory, or excessive CPU consumption on attacker controlled requests.

### Impact

An attacker could cause resource exhaustion through specially crafted requests.

---

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